Can hayfever pollen cause anaphylaxis?

Hay fever reactions?: While it is possible to see a variety of symptoms with seasonal allergies, such as sneezing, nasal congestion, eye redness, swelling and wheezing, a true anaphylactic reaction is rare. The severe, sudden onset of allergic symptoms associated with anaphylaxis might be seen as a reaction to an allergy shot to treat hay fever, but more commonly is seen with foods, medications, and insect stings, .

Unlikely: Pollen causing "hay fever" is inhaled commonly causing the nasal or chest symptoms associated with allergic disease. Anaphylaxis is generally caused by something injected (medication, insect venom) or something ingested ( peanut, tree nuts or sea food) which causes the systemic symptoms.

Not usually: Not usually but if the exposure is intense enough it is possible. Perhaps an allergist in healthtap can chime in with more information?

Anything is possible: It all depends on what you mean. Anaphylaxis, as defined by the involvement of more than one organ system, could surely cause anaphylaxis by causing asthmatic and urticarial/angioedema reactions. In terms of causing hypotension, i would assume that it is possible, but is rarely seen.